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London St Pancras International to Heathrow Airport by train

It takes an average of 59m to travel from London St Pancras International to Heathrow Airport by train, over a distance of around 15 miles (24 km). There are normally 352 trains per day traveling from London St Pancras International to Heathrow Airport and tickets for this journey start from $16.35 when you book in advance.

First train

04:30

Last train

23:02

Departure station

London St Pancras International

Arrival station

Heathrow Airport

Journey time

From 44m

Distance

15 miles (24 km)

Frequency

352 trains per day

Changes

1 change

Price

From $16.35

Train operators

Thameslink

Traveling by train from London St Pancras International to Heathrow Airport

Heading to the airport and need more information on how to travel from London St Pancras International to Heathrow Airport by train? Start your journey with us!  

Usually, the train journey from London St Pancras International to Heathrow Airport takes around 1 hour and 17 minutes, although the fastest services can take as little as 1 hour and 13 minutes. As there are no direct trains available on this route, you will need to make at least one change during your journey.  

If you’re traveling on this route, you’ll need to head to Kings Cross St Pancras underground station and take the tube to Paddington station. From here, you can jump on the Heathrow Express to the airport. On board you’ll find amenities such as comfortable seating, luggage racks, toilets and bike storage. If you prefer to travel in style, upgrade to Heathrow Express First Class and you’ll enjoy extra legroom, a personal table, power sockets and 4G-enabled WiFi. Before you know it, you will arrive at Heathrow Airport station.  

Servicing around 75 million passengers each year, Heathrow Airport is the UK’s busiest airport. Boasting four terminals, there’s plenty to keep you entertained before boarding your flight, including shops, cafes, restaurants and bars.  

Want to book cheap train tickets? Try to travel at Off-Peak times, as tickets tend to be cheaper outside of morning/evening rush hours on weekdays. Also, try to book an Advance ticket – they are normally released 12 weeks before the departure date and are usually a lot cheaper than purchasing tickets on the day of travel.  

Ready to book? Start a search for cheap train tickets from London St Pancras International to Heathrow Airport now. There’s no need to wait, just head to our Journey Planner at the top of the page! If you’d like to read more information about the train journey, keep reading for FAQs, timetables with first and last train times, as well as tips on booking cheap tickets.  

FAQs for London St Pancras International to Heathrow Airport

Want to know more about your journey from London St Pancras International to Heathrow Airport? We've compiled some of the most frequently asked questions by our customers to help you plan your journey.

How long does the train from London St Pancras International to Heathrow Airport take?

The average journey time by train between London St Pancras International and Heathrow Airport is 59 minutes, with around 352 trains per day. The journey time may be longer on weekends and holidays, so use our Journey Planner on this page to search for a specific travel date.

What's the fastest journey time between London St Pancras International and Heathrow Airport by train?

The fastest journey time by train from London St Pancras International to Heathrow Airport is 44 minutes.

How much does the train from London St Pancras International to Heathrow Airport cost?

Train tickets from London St Pancras International to Heathrow Airport can start from as little as $16.35 when you book in advance and are usually more expensive when purchased on the day. Prices can also vary depending the time of day, route and class you book.

Is there a direct train from London St Pancras International to Heathrow Airport?

No, there are no direct train services from London St Pancras International to Heathrow Airport. Travelling from London St Pancras International to Heathrow Airport by train will require a minimum of 1 change.

What time does the first train from London St Pancras International to Heathrow Airport leave?

The first train from London St Pancras International to Heathrow Airport leaves at 04:30. Times and services may vary during weekends and holidays.

What time does the last train from London St Pancras International to Heathrow Airport leave?

The last train from London St Pancras International to Heathrow Airport leaves at 23:02. Trains that depart in the early morning hours or very late evening may be sleeper services, time and services may also vary during weekends and holidays.

What's the distance between London St Pancras International and Heathrow Airport by train?

Trains travelling from London St Pancras International to Heathrow Airport cover a distance of around 15 miles (24 km) during the journey.

Looking for more information?

If you’re looking for the return train journey, check out trains from Heathrow Airport to London St Pancras International.

Cheap train tickets from London St Pancras International to Heathrow Airport

Train tickets from London St Pancras International to Heathrow Airport start at $16.35 one way for a Standard Class ticket if you book in advance. As most UK train companies increase their prices as the departure date approaches, we’ll help you find the cheapest tickets.

Book in advance

Look out for Advance tickets – they usually come out up to 12 weeks before the departure date and can be cheaper than buying on the day. If you’re here a tad early, sign up for our Advance ticket alert today to get notified when your tickets are released.

Consider a Season Ticket

If you catch this train more than 3 times per week, you could save money with a Season Ticket. With annual, monthly and weekly options available, find out if a season ticket for London St Pancras International to Heathrow Airport is right for you.

Use your Railcard

National Railcards offer a 1/3 off eligible train tickets in the UK and can be a great investment if you travel a few times or more in a year. Find out how you can save with a National Railcard here.

Split your tickets

Download our app to find split tickets — courtesy of SplitSave, our handy feature which 'splits' your train tickets where possible to find you a better deal. Learn more about the clever tech behind split tickets, and how to spot SplitSave discounts in our app.

For more money-saving tips on UK and European train travel, read our cheap train tickets guide.

Advance adult single fare. Excludes booking fee. Prices seen by Trainline customers in the last 30 days. Availability limited.

What are my ticket options for this journey?

If you're like us, you've probably seen the sheer number of ticket types available in the UK and wondered "Why are there so many?!" To help, we've put together a handy guide to the main UK ticket types, simply tap the one you’re interested in to find out more.

* Based on European average monthly visitors to Trainline’s app and website from 1.1.2023 to 10.31.2023 vs other independent retailers.

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